Wireless transmission.



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(moss REFERML PATENTED JULY 2, 1907- H. A. YARNELL. WIRELESSTRANSMISSION.

APPi-IOAIIOH FILED APB.23.1906.

' mnzzr @Ziiasses UNITED STATES PATENT OFFICE.

HAROLD A. 'YARNELL, OF LOS ANGELES, CALIFORNIA, ASSIGNOR TO PACIFICWIRELESS TELEGRAPH COMPANY, OF LOS ANGELES, CALIFORNIA, A CORPORATION OFCALI- FORNIA.

WIRELESS TRANSMISSION.

Specification of Letters Patent.

Patented Jul 2, 1907.

To all whom 'it may concern:

Be it known that I, HAROLD A. YARNELL, a citizen of the United States,residing at Los Angeles, county of Los Angeles, and State of California,have invented new and useful Improvements in Wireless Transmission, ofwhich the following is a specification.

This invention relates to wireless transmission and the main object ofthe invention is to eliminate the losses due to the ground connectionheretofore employed and to thus increase the efficiency of the system.

The accompanying drawing illustrates the invention and referringthereto: I

Figure 1 is a perspective view showing the reservoir applied to thetransmitting apparatus, with part of the envelop broken away to disclosethe interior. Fig. 2 is a section, enlarged, on line 2: x Fig. 1.

1 designates a spark coil which may be of the usual or any desiredconstruction.

2 designates the aerial wire connection to one of the terminals of thespark coil. The other terminal of the coil instead of having a groundconnection as ordinarily heretofore employed is connected by a wire 3with a device which I term a reservoir 4.

A long closed envelop 5 is provided which may be constructed of woodwith a roof as shown. Suspended within the envelop by insulators6,,which may be porcelain tubes, is a long solid sheet of tin forming aca-' pacity 7, which may be built up from several smaller sheets of tin,all soldered together as indicated. I construct the envelop about twentyfour feet long, by about twenty two inches wide, and two and a hall feetdeep. The tin may be twenty two feet long. Extending through the roof ofthe envelop nearone end is a large glass tube 8 filled with paraflin,and in the center is a smaller glass tube 9 through which runs theinsulated wire 3 connected with the spark coil. The end of the wire 3inside the envelop is connected with the tin 7. If desired the reservoirmay be buried. It will be observed that the tin capacity 7 is insulatedall around as it is hung from insulators and there is a space of about afoot all around between it and the envelop. The edges of the tin shouldbe crimped over a wire 10 in order to present a smooth round edgeinstead of a thin sharp edge which would cause loss of current. Byconstructing the reservoir in this manner a great capacity is securedand. yet the device may be constructed very economically, and wheninstalled by burying, it economizes space and is not subject toatmospheric variations in temperature or to leakage. The sloping roofsheds moisture and prevents it irom accu mulating on top of the envelop,and the hood on the insulator 8 prevents any moisture from entering atthat point. The open construction permits of easy inspec- 1. In awireless transmission, a spark producer, an aerial capacity connected toone terminal thereof, and 5. ms

ervoir comprising an elongated subterranean chamber, an

elongated plate of great area within said chamber and insulated from thewalls of the chamber, and a connection from the plate to'the otherterminal of the spark producer.

2. In wireless transmission, a spark producer, a reservoir connected toone terminal of the spark producer, said reservoir comprising anelongated chamber, an elongated plate of great area within said chamberhung pendent and insulated from the walls of said chamber, and a signalprojecting device connected to the other terminal of the spark producer.

3. In wireless transmission, a spark producer, an aerial capacityconnected with one terminal thereof, a. reservoir comprising anelongated subterranean chamber, an elongated metallic plate suspended inthe center of said chamher, there being considerable air space betweensaid plate and the walls of said chamber, insulators supporting saidplate, and a connection from said piateextending through the wall ofsaid chamber to said spark producer, said connection being insulatedfrom the wall of said chamber.

4. In wireless transmission, a spark producer, an aerial capacityconnected with one terminal thereof, a reservoir comprising an elongatedsubterranean chamber, an elongated metallic plate suspended in thecenter of said chamber, the edges of said plate being curled, therebeing considerable air space between said plate and the walls of saidchamber, insulators supporting said plate, and a connection from saidplate extending through the wall of said chamber to said spark producer,said connection being in sulated from the wall of said chamber.

5. In wireless transmission, a spark coil having an aerial terminal anda non-aerial terminal, a reservoir comprising a long wooden chamberhaving a pitched roof buriedin the ground, a. long sheet of tin withinsaid chamber, insulators depending from the roof of said chamber andsupporting said sheet, a wire extending .from said sheet to the sparkcoil, an insulator in the wall of said chamber through which said wirepasses and filled with paraffin which surrounds the wire and with a hoodat its outer end to prevent the entrance of moisture to said chamber,there being -a large air space within the chamber on all sides of thetin sheet.

In testimony whereof, I have hereunto set my hand at Seattle Washingtonthis 17th day of April, 1906.

HA'ROLD A. YARNELL. In presence of FRANK L. SMITH, J. F. Burton. 0'

